Provide a brief definition and a description of the significance of the following terms in NMR spectroscopy (4) a 90o pulse (5) J coupling (6) distance geometry
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Provide a brief definition and a description of the significance of the following terms in NMR spectroscopy
(4) a 90o pulse
(5) J coupling
(6) distance geometry
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- Provide a brief definition and a description of the significance of the following terms in NMR spectroscopy (7) intermediate exchange(8) SAR by NMR(9) the Larmour frequencyProvide a brief definition and a description of the significance of the following terms in NMR spectroscopy (1) CW-NMR spectroscopy (2) the nuclear Overhauser effect (3) the free induction decay(4) a 90o pulse(5) J coupling(6) distance geometry(7) intermediate exchange(8) SAR by NMR(9) the Larmour frequency(10) residual dipolar couplingsNMR is considered a low-sensitivity spectroscopic technique. What is the physical basis of NMR's insensitivity?
- Calculate the average dipole–induced-dipole interaction energy, in joules per mole (J mol−1), between a water molecule and a benzene molecule separated by 1.0 nm.Discuss the physical orig ins of the gross selection rules for infrared spectroscopy and vibrational Raman spectroscopy.Justify and explain following statements. (a) Paper chromatography is a type of partition chromatography. (b) The R f value is 1. (c) Chromatography is only a qualtitative technique. (d) The adsorbent should be insoluble in the solvent. (e) Chromatography is used to separate only color compounds.
- B The (Me2C3C%3DCM 2)Fe(CO)4 below -60 C shows three peaks in the intensity ratio 1:1:2 but at 30 °C only a singie, sharp and intense peak is observed. Explain 'H-NMR spectrum of with reference to its structure.Guanosine (C10H13N5O5) in solution has a maximum absorbance at a wavelength of 275 nm. The molar extinction co-efficient at this wavelength is 84M−1cm−1and the path length is 24.7 cm. Through the use of a spectrophotometer, it is found that the that A275= 1.48. What is the concentration of the guanosine solution in grams/litre? Molecular weights (g/mol): C-12, H-1, N-14, O-16 Select one: A. 0.201869 g/L B. 0.435188 g/L C. 0.059919 g/L D. 0.294046 g/L E. 0.000713 g/LPaper electrophoresis of Asn, Ala, Asp, Lys and Ser mixtures at pH = 7 shows the fastest movement towards the anode The fully saponified 10g oil sample consumed 1.87g KOH, and the iodine value of the oil was 28.3. So how many unsaturated double bonds are there in each oil molecule on average? (lodine is known to have an atomic weight of 127) Given that 100g cellulose sample is completely hydrolyzed to obtain 78g glucose, then the percentage of cellulose in the sample is _% Given that the Km of catalase is 20mmol/L and the substrate concentration is 80mmol/L, then the percentage of catalase bound to the substrate is %
- Below is a Beer's Law Plot for the concentration of a specific colored compound x. A solution of compound X is measured with the spectrophotometer to have an optical density of 0.60. a) What is the concentration of compound X in this solution. Answers must contain proper units for full credit. b) The absorbance of this compound was measured at 540 nm. Why was this absorbance chosen? 0.9 0.8 0.7 0.6 805 4 0.4 0.3 0.2 Absorbance at 540 mWhat is the chemistry principle behind when (treatment: heavy cream) is subjected to room temperature? Why does beating time, stability (%drain) and volume foam (specific gravity) is important? see the data below Treatment (Heavy Cream) Beating Time (min) Stability (%drain) Volume of Foam (Specific Gravity) (Room Temperature) 20 No drain 0.94 Heavy Cream (chilled) 20 No drain 0.76 Heavy Cream with sugar and vanilla 20 No drain 0.88 Heavy Cream (over-whipped) 25 No drain 0.83The main constituents in vinegar are water and ethanoic acid (CH3COOH). In order to determine the concentration of acid in homemade vinegar, a student titrated 25 cm3 of 001 M NaOH against the vinegar. The equation for the reaction is: CH3COOH(aq) + NaOH(aq) ® CH3COONa(aq) + H2O(l) The following titration results were obtained: Burette readings (cm3) Rough 1 2 Final burette reading 20.10 38.90 31.40 Initial burette reading 0.10 20.00 12.50 Volume of vinegar used 20.00 18.90 18.90 (a) What volume of vinegar should be used in the calculation? (b) What is the mole ratio of NaOH:CH3COOH? (c) Calculate the number of moles of alkali in 25 cm3 of NaOH solution used. (d) How many moles of acid were used in the titration? (e) Calculate the…